The S-400 is the linchpin of the Indian air defence architecture, as was demonstrated during Operation Sindoor. The system can fire a missile at an aircraft as far as 400 kms away and can therefore control vast swathes of airspace. The system was able to shoot down a large Pakistani aircraft at a distance of over 300 kms. With the delivery of the fourth S-400 system, the air force has expanded the area under coverage of the S-400 system. The entire S-400 system rests on a series of long range radars and long range interceptor missiles that are designed to take out different types of aerial threats ranging from drones al the way to ballistic missiles, thus the system is able to perform the role of different types of air defence systems.The genius of the S‑400 Triumf is that it works by integrating powerful phased‑array radars with multiple missile types, each tailored to different ranges and threats. The system can launch missiles vertically, allowing rapid engagement in any direction, and its radars provide full 360‑degree coverage at ranges of up to 600 km, enabling detection of stealth aircraft and high‑speed projectiles. A full squadron can track and engage dozens more, making it highly effective in complex air combat environments. The range of the S‑400 can intercept threats at ranges far exceeding the reach of systems such as the US Patriot PAC‑3 or Europe’s SAMP/T NG. It can also defend against intermediate‑range ballistic missiles, a capability absent in most Western systems.The S‑400 Triumf air defence system is built around a sophisticated radar suite that provides layered surveillance, target acquisition, and fire‑control. At its core is the 91N6E “Big Bird” radar, an L‑band long‑range acquisition radar capable of detecting large aircraft up to 600 km away, resistant to jamming and stealth countermeasures. Supporting this is the 92N6E ‘Grave Stone’ radar, an X‑band engagement radar that manages fire‑control and missile guidance, able to lock onto 36 targets and guide missiles to 72 simultaneously.To cover altitude ranges, the 96L6E all‑altitude detector radar operates in the S‑band, detecting targets up to 300 km, including low‑flying aircraft and cruise missiles, making it effective in mountainous terrain or ECM‑heavy environments. Optional radars like the Protivnik‑GE extend early warning against stealth aircraft. Together, these radars provide 360‑degree situational awareness, eliminate blind spots, and enable the S‑400 to track hundreds of targets, ensuring layered defence and rapid, coordinated responses to diverse aerial threats.The S‑400 Triumf air defence system is distinguished by its versatile missile family, each designed to counter specific categories of aerial threats. At the top end is the 40N6E, the longest‑range missile in the system, capable of engaging high‑altitude aircraft and aerodynamic targets at distances of up to 400 km. This missile provides the strategic reach needed to neutralize threats before they approach critical airspace. Complementing it is the 48N6E3, a long‑range interceptor effective against aircraft, cruise missiles, and even ballistic missiles, with an engagement radius of up to 250 km. It forms the backbone of the system’s layered defence, ensuring robust coverage against conventional aerial threats.For medium‑range engagements, the 9M96E2 is tailored to counter highly maneuverable targets such as fighter aircraft and drones. With a range of up to 120 km, it offers agility and precision, making it particularly effective against fast, evasive threats. Finally, the 9M96E provides short‑to‑medium‑range protection, designed for precise point defence against low‑altitude, fast‑moving targets, with a reach of up to 40 km. This missile is crucial for close‑in defence, ensuring that no threat slips through the outer layers.Strategically, the S‑400 has been deployed by Russia, China, Turkey, and India, and has proven its utility in contested theatres such as Syria and Ukraine. For India, the system provides a critical shield against both Pakistani and Chinese aerial threats, covering large swathes of territory. Its combination of long‑range engagement, multi‑target tracking, and advanced radar coverage makes it more effective than most other systems, positioning it as one of the most formidable air defence systems.
